The Spheres of Influence, “Assessing Assays” (Schmidt 2002), in the May 2002 issue of EHP criticizes the National Toxicology Program rodent bioassay (NTPRB) without discussing its importance in regulation and public health. The Spheres article (Schmidt 2002) does not express concern for the validity of alternative transgenic methods proposed to replace the NTPRB for detecting carcinogens. By fo...
